OF SEVERAL PARTS OF WESTERN ASIA. 395 



Still another confirmation of the same views, is found in nu- 

 merous mineral springs which occur in the vicinity of Trebizond, 

 upon the mountain ridges, though these do not necessarily indi- 

 cate any very recent volcanic agency. Nos. 497, 498 are speci- 

 mens of two of these springs ; the latter twelve miles southwest 

 from the city, and the other seven miles to the southeast. These 

 waters are used by the inhabitants, especially the Engli^ and 

 Americans of that city ; and, if my analysis is correct, one of them 

 at least may lay claim to a high character. I ought to say, 

 however, that as I received these specimens only about six 

 weeks ago, it has been impossible to go into all those minute 

 details of analysis that would have been desirable. My results, 

 however, may be of some service. 



No. 498 belongs to the class of simple carbonated waters. 

 The amount of free carbonic acid and of the earthy carbonates 

 held in solution by this acid, was obtained by the method recom- 

 mended by Berzelius, in his Traite de Chimie, by distilling 

 the gas into lime-water. The amount of earthy carbonates and 

 the other solid ingredients was so small, that I thought it useless 

 to separate them; though they must somewhat increase the 

 value of the water. Bromine I detected by the chlorine test, as 

 recommended by Dr. Schweitzer, in his analysis of sea water. 

 The carbonic acid must of course be less than exists in the water 

 as it issues from the earth. I could detect no difference between 

 the specific gravity of this and common water. 



A wine pint of the water contains as follows : 



Carbonic acid, 10.9 cubic inches. 



Earthy carbonates, .... 0.5 grain. 

 Chlorides of sodium, of calcium, of magne- 

 sium, and a bromide, . . . 0.5 grain. 



This spring may undoubtedly be of some service in a medical 

 point of view, especially as it contains the powerful ingredient 

 bromine, although I could not detect iodine in it. But the other 

 spring. No. 497, is much more powerful. Indeed, if I mistake 

 not, it ranks among the best sulphureted waters known, though I 

 did not find in it either iodine or bromine. 



Specific gravity, 1.002 



